Use simple js code to create range

[kristw]

🐛 Bug Fix

The current code is using Array(n).keys() which requires iterator polyfill. Switch to plain old js for simplicity.

[xtinec]

LGTM.

[codecov]

Codecov Report

Merging #24 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #24   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          30     37    +7     
  Lines         260    325   +65     
=====================================
+ Hits          260    325   +65

Impacted Files	Coverage Δ
packages/superset-ui-color/src/SequentialScheme.js	100% <100%> (ø)	⬆️
.../src/registries/ChartComponentRegistrySingleton.js	100% <0%> (ø)
...t/src/registries/ChartMetadataRegistrySingleton.js	100% <0%> (ø)
...src/registries/ChartBuildQueryRegistrySingleton.js	100% <0%> (ø)
...registries/ChartTransformPropsRegistrySingleton.js	100% <0%> (ø)
...ages/superset-ui-chart/src/models/ChartMetadata.js	100% <0%> (ø)
...ackages/superset-ui-chart/src/models/ChartProps.js	100% <0%> (ø)
...ckages/superset-ui-chart/src/models/ChartPlugin.js	100% <0%> (ø)

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